i have a version 4 playstation and i bought a no solder mod chip for it with the swap magic discs and after i put it in and put my ps2 back together it stoped playing dvds for example it wont play any store bought dvd games(ps2), the swap magic dvd version, or dvd movies, but it will play cd games(ps1)
can somebody pleas help me

Remove the chip and try again. If it works without the chip, then you're having an oncompatability problem. Also, with the no-solder chip you need to "flash" the "bios" of the chip. Granted if the chip is not "flashed" then it wouldn't work at all, but just so you know that you need to do that as well. If you remove the chip and it still doesn't play the games, you may have a lens problem. Hopefully it's just that you need to re-install the chip. Post your results when you can.